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          <td class="headerValue" width="20%">2009-06-09</td>
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      <td><pre class="source">
<span class="lineNum">       1 </span>                : // Types used in iterator implementation -*- C++ -*-
<span class="lineNum">       2 </span>                : 
<span class="lineNum">       3 </span>                : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
<span class="lineNum">       4 </span>                : // Free Software Foundation, Inc.
<span class="lineNum">       5 </span>                : //
<span class="lineNum">       6 </span>                : // This file is part of the GNU ISO C++ Library.  This library is free
<span class="lineNum">       7 </span>                : // software; you can redistribute it and/or modify it under the
<span class="lineNum">       8 </span>                : // terms of the GNU General Public License as published by the
<span class="lineNum">       9 </span>                : // Free Software Foundation; either version 2, or (at your option)
<span class="lineNum">      10 </span>                : // any later version.
<span class="lineNum">      11 </span>                : 
<span class="lineNum">      12 </span>                : // This library is distributed in the hope that it will be useful,
<span class="lineNum">      13 </span>                : // but WITHOUT ANY WARRANTY; without even the implied warranty of
<span class="lineNum">      14 </span>                : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
<span class="lineNum">      15 </span>                : // GNU General Public License for more details.
<span class="lineNum">      16 </span>                : 
<span class="lineNum">      17 </span>                : // You should have received a copy of the GNU General Public License along
<span class="lineNum">      18 </span>                : // with this library; see the file COPYING.  If not, write to the Free
<span class="lineNum">      19 </span>                : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
<span class="lineNum">      20 </span>                : // USA.
<span class="lineNum">      21 </span>                : 
<span class="lineNum">      22 </span>                : // As a special exception, you may use this file as part of a free software
<span class="lineNum">      23 </span>                : // library without restriction.  Specifically, if other files instantiate
<span class="lineNum">      24 </span>                : // templates or use macros or inline functions from this file, or you compile
<span class="lineNum">      25 </span>                : // this file and link it with other files to produce an executable, this
<span class="lineNum">      26 </span>                : // file does not by itself cause the resulting executable to be covered by
<span class="lineNum">      27 </span>                : // the GNU General Public License.  This exception does not however
<span class="lineNum">      28 </span>                : // invalidate any other reasons why the executable file might be covered by
<span class="lineNum">      29 </span>                : // the GNU General Public License.
<span class="lineNum">      30 </span>                : 
<span class="lineNum">      31 </span>                : /*
<span class="lineNum">      32 </span>                :  *
<span class="lineNum">      33 </span>                :  * Copyright (c) 1994
<span class="lineNum">      34 </span>                :  * Hewlett-Packard Company
<span class="lineNum">      35 </span>                :  *
<span class="lineNum">      36 </span>                :  * Permission to use, copy, modify, distribute and sell this software
<span class="lineNum">      37 </span>                :  * and its documentation for any purpose is hereby granted without fee,
<span class="lineNum">      38 </span>                :  * provided that the above copyright notice appear in all copies and
<span class="lineNum">      39 </span>                :  * that both that copyright notice and this permission notice appear
<span class="lineNum">      40 </span>                :  * in supporting documentation.  Hewlett-Packard Company makes no
<span class="lineNum">      41 </span>                :  * representations about the suitability of this software for any
<span class="lineNum">      42 </span>                :  * purpose.  It is provided &quot;as is&quot; without express or implied warranty.
<span class="lineNum">      43 </span>                :  *
<span class="lineNum">      44 </span>                :  *
<span class="lineNum">      45 </span>                :  * Copyright (c) 1996-1998
<span class="lineNum">      46 </span>                :  * Silicon Graphics Computer Systems, Inc.
<span class="lineNum">      47 </span>                :  *
<span class="lineNum">      48 </span>                :  * Permission to use, copy, modify, distribute and sell this software
<span class="lineNum">      49 </span>                :  * and its documentation for any purpose is hereby granted without fee,
<span class="lineNum">      50 </span>                :  * provided that the above copyright notice appear in all copies and
<span class="lineNum">      51 </span>                :  * that both that copyright notice and this permission notice appear
<span class="lineNum">      52 </span>                :  * in supporting documentation.  Silicon Graphics makes no
<span class="lineNum">      53 </span>                :  * representations about the suitability of this software for any
<span class="lineNum">      54 </span>                :  * purpose.  It is provided &quot;as is&quot; without express or implied warranty.
<span class="lineNum">      55 </span>                :  */
<span class="lineNum">      56 </span>                : 
<span class="lineNum">      57 </span>                : /** @file stl_iterator_base_types.h
<span class="lineNum">      58 </span>                :  *  This is an internal header file, included by other library headers.
<span class="lineNum">      59 </span>                :  *  You should not attempt to use it directly.
<span class="lineNum">      60 </span>                :  *
<span class="lineNum">      61 </span>                :  *  This file contains all of the general iterator-related utility types,
<span class="lineNum">      62 </span>                :  *  such as iterator_traits and struct iterator.
<span class="lineNum">      63 </span>                :  */
<span class="lineNum">      64 </span>                : 
<span class="lineNum">      65 </span>                : #ifndef _STL_ITERATOR_BASE_TYPES_H
<span class="lineNum">      66 </span>                : #define _STL_ITERATOR_BASE_TYPES_H 1
<span class="lineNum">      67 </span>                : 
<span class="lineNum">      68 </span>                : #pragma GCC system_header
<span class="lineNum">      69 </span>                : 
<span class="lineNum">      70 </span>                : #include &lt;bits/c++config.h&gt;
<span class="lineNum">      71 </span>                : #include &lt;cstddef&gt;
<span class="lineNum">      72 </span>                : 
<span class="lineNum">      73 </span>                : _GLIBCXX_BEGIN_NAMESPACE(std)
<span class="lineNum">      74 </span>                : 
<span class="lineNum">      75 </span>                :   //@{
<span class="lineNum">      76 </span>                :   /**
<span class="lineNum">      77 </span>                :    *  @defgroup iterator_tags Iterator Tags
<span class="lineNum">      78 </span>                :    *  These are empty types, used to distinguish different iterators.  The
<span class="lineNum">      79 </span>                :    *  distinction is not made by what they contain, but simply by what they
<span class="lineNum">      80 </span>                :    *  are.  Different underlying algorithms can then be used based on the
<span class="lineNum">      81 </span>                :    *  different operations supported by different iterator types.
<span class="lineNum">      82 </span>                :   */
<span class="lineNum">      83 </span>                :   ///  Marking input iterators.
<span class="lineNum">      84 </span>                :   struct input_iterator_tag {};
<span class="lineNum">      85 </span>                :   ///  Marking output iterators.
<span class="lineNum">      86 </span>                :   struct output_iterator_tag {};
<span class="lineNum">      87 </span>                :   /// Forward iterators support a superset of input iterator operations.
<span class="lineNum">      88 </span>                :   struct forward_iterator_tag : public input_iterator_tag {};
<span class="lineNum">      89 </span>                :   /// Bidirectional iterators support a superset of forward iterator
<span class="lineNum">      90 </span>                :   /// operations.
<span class="lineNum">      91 </span>                :   struct bidirectional_iterator_tag : public forward_iterator_tag {};
<span class="lineNum">      92 </span>                :   /// Random-access iterators support a superset of bidirectional iterator
<span class="lineNum">      93 </span>                :   /// operations.
<span class="lineNum">      94 </span>                :   struct random_access_iterator_tag : public bidirectional_iterator_tag {};
<span class="lineNum">      95 </span>                :   //@}
<span class="lineNum">      96 </span>                : 
<span class="lineNum">      97 </span>                : 
<span class="lineNum">      98 </span>                :   /**
<span class="lineNum">      99 </span>                :    *  @brief  Common %iterator class.
<span class="lineNum">     100 </span>                :    *
<span class="lineNum">     101 </span>                :    *  This class does nothing but define nested typedefs.  %Iterator classes
<span class="lineNum">     102 </span>                :    *  can inherit from this class to save some work.  The typedefs are then
<span class="lineNum">     103 </span>                :    *  used in specializations and overloading.
<span class="lineNum">     104 </span>                :    *
<span class="lineNum">     105 </span>                :    *  In particular, there are no default implementations of requirements
<span class="lineNum">     106 </span>                :    *  such as @c operator++ and the like.  (How could there be?)
<span class="lineNum">     107 </span>                :   */
<span class="lineNum">     108 </span>                :   template&lt;typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
<span class="lineNum">     109 </span>                :            typename _Pointer = _Tp*, typename _Reference = _Tp&amp;&gt;
<span class="lineNum">     110 </span>                :     struct iterator
<span class="lineNum">     111 </span>                :     {
<span class="lineNum">     112 </span>                :       /// One of the @link iterator_tags tag types@endlink.
<span class="lineNum">     113 </span>                :       typedef _Category  iterator_category;
<span class="lineNum">     114 </span>                :       /// The type &quot;pointed to&quot; by the iterator.
<span class="lineNum">     115 </span>                :       typedef _Tp        value_type;
<span class="lineNum">     116 </span>                :       /// Distance between iterators is represented as this type.
<span class="lineNum">     117 </span>                :       typedef _Distance  difference_type;
<span class="lineNum">     118 </span>                :       /// This type represents a pointer-to-value_type.
<span class="lineNum">     119 </span>                :       typedef _Pointer   pointer;
<span class="lineNum">     120 </span>                :       /// This type represents a reference-to-value_type.
<span class="lineNum">     121 </span>                :       typedef _Reference reference;
<span class="lineNum">     122 </span>                :     };
<span class="lineNum">     123 </span>                : 
<span class="lineNum">     124 </span>                :   /**
<span class="lineNum">     125 </span>                :    *  This class does nothing but define nested typedefs.  The general
<span class="lineNum">     126 </span>                :    *  version simply &quot;forwards&quot; the nested typedefs from the Iterator
<span class="lineNum">     127 </span>                :    *  argument.  Specialized versions for pointers and pointers-to-const
<span class="lineNum">     128 </span>                :    *  provide tighter, more correct semantics.
<span class="lineNum">     129 </span>                :   */
<span class="lineNum">     130 </span>                :   template&lt;typename _Iterator&gt;
<span class="lineNum">     131 </span>                :     struct iterator_traits
<span class="lineNum">     132 </span>                :     {
<span class="lineNum">     133 </span>                :       typedef typename _Iterator::iterator_category iterator_category;
<span class="lineNum">     134 </span>                :       typedef typename _Iterator::value_type        value_type;
<span class="lineNum">     135 </span>                :       typedef typename _Iterator::difference_type   difference_type;
<span class="lineNum">     136 </span>                :       typedef typename _Iterator::pointer           pointer;
<span class="lineNum">     137 </span>                :       typedef typename _Iterator::reference         reference;
<span class="lineNum">     138 </span>                :     };
<span class="lineNum">     139 </span>                : 
<span class="lineNum">     140 </span>                :   template&lt;typename _Tp&gt;
<span class="lineNum">     141 </span>                :     struct iterator_traits&lt;_Tp*&gt;
<span class="lineNum">     142 </span>                :     {
<span class="lineNum">     143 </span>                :       typedef random_access_iterator_tag iterator_category;
<span class="lineNum">     144 </span>                :       typedef _Tp                         value_type;
<span class="lineNum">     145 </span>                :       typedef ptrdiff_t                   difference_type;
<span class="lineNum">     146 </span>                :       typedef _Tp*                        pointer;
<span class="lineNum">     147 </span>                :       typedef _Tp&amp;                        reference;
<span class="lineNum">     148 </span>                :     };
<span class="lineNum">     149 </span>                : 
<span class="lineNum">     150 </span>                :   template&lt;typename _Tp&gt;
<span class="lineNum">     151 </span>                :     struct iterator_traits&lt;const _Tp*&gt;
<span class="lineNum">     152 </span>                :     {
<span class="lineNum">     153 </span>                :       typedef random_access_iterator_tag iterator_category;
<span class="lineNum">     154 </span>                :       typedef _Tp                         value_type;
<span class="lineNum">     155 </span>                :       typedef ptrdiff_t                   difference_type;
<span class="lineNum">     156 </span>                :       typedef const _Tp*                  pointer;
<span class="lineNum">     157 </span>                :       typedef const _Tp&amp;                  reference;
<span class="lineNum">     158 </span>                :     };
<span class="lineNum">     159 </span>                : 
<span class="lineNum">     160 </span>                :   /**
<span class="lineNum">     161 </span>                :    *  This function is not a part of the C++ standard but is syntactic
<span class="lineNum">     162 </span>                :    *  sugar for internal library use only.
<span class="lineNum">     163 </span>                :   */
<span class="lineNum">     164 </span>                :   template&lt;typename _Iter&gt;
<span class="lineNum">     165 </span>                :     inline typename iterator_traits&lt;_Iter&gt;::iterator_category
<span class="lineNum">     166 </span><span class="lineCov">            210 :     __iterator_category(const _Iter&amp;)</span>
<span class="lineNum">     167 </span><span class="lineCov">            210 :     { return typename iterator_traits&lt;_Iter&gt;::iterator_category(); }</span>
<span class="lineNum">     168 </span>                : 
<span class="lineNum">     169 </span>                : _GLIBCXX_END_NAMESPACE
<span class="lineNum">     170 </span>                : 
<span class="lineNum">     171 </span>                : #endif /* _STL_ITERATOR_BASE_TYPES_H */
<span class="lineNum">     172 </span>                : 
</pre>
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